There's no two-ways about it. Google's Pixel 3 phones run Google's own version of Android, and it's the best version compared to the redesigned and sometimes cluttered versions of Android you sometimes find on other phones.
Plus, you get the latest Android updates as soon as they're released with the Pixel 3's version of Android, whereas you might need to wait months for an Android update from certain other smartphone makers.
iOS is great and reliable, too, but I'm pretty bored by it. I like the customization options in Android, and it's a smarter interface than iOS, especially with notifications.